“You have moreover multiplied your whoredom in the land of Canaan as far as Chaldea and yet you were not satisfied herewith.”
Now the Babylonian gods were included in their worship, both in Jerusalem and in exile (as we have seen earlier they had a whole miscellany of gods - chapter 8). So the whole of their history since the time of Solomon has been one of unfaithfulness to Yahweh and slavering over other gods, together with the immoral ways of those gods. Yet still they were not satisfied.